Brake operating mechanism



Aug. 12, 1952 c J. KEIM 2,606,629

BRAKE OPERATING MECHANISM Filed Dec. 29, 1949 4 Sheets-Sheet 1 INVIISNTOR CHARLES J. KEIM BY And, fid a,

ATTORNEY g 12, 1952 c. J. KEIM 2,606,629

BRAKE OPERATING MECHANISM Filed Dec. 29, 1949 4 Sheets-Sheet 2 INVENTOR.

CHARLES J. KEIM ATTORNEY Aug. 12, 1952 c. J. KEIM 2,606,629

BRAKE OPERATING MECHANISM Filed Dec. 29, 1949 4 Sheets-Sheet 5 INVENTOR.

CHARLES J. KEIM ATTORN E Y Aug. 12, 1952 c. J. KEIM BRAKE OPERATING MECHANISM 4 Sheets-Sheet 4 Filed Dec. 29, 1949 INVENTOR. CHARLES J. KEIM AMA 44 54;,

ATTORN EY Patented Aug. 12, 1952 ()FFECE BRAKE QKERATHNG MECHANISM Gh-arles .l. Kenn, on; City, Pa, assignor tea-United States Steel Company, a corporation of New Hersey Application December 29, 1949, SerialNo. 135,598

6 Claims.

This invention relates to improvements in brake operating mechanisms, particularly for hoist reel brakes which have compound leverage systems.

An object of the invention is to provide improved brake operating mechanisms which are of the compound leverage type but which have fewer parts and are of simpler construction than previous mechanisms with which I am familiar.

A further object of the invention is to provide improved brake operating mechanisms which can be removed or installed as a unit and which include an integral supporting assembly of base plate, bearings, pivot ears and equalizer bracket, thus assuring that the parts always are aligned properly.

A further object of theinvention is to provide improved brake opcratingmechanisms which are of the compound leverage type and yet employ only a single operating shaft and also eliminate at least one of the levers usually employed for Figure 2 is a vertical sectional view taken substantially on line 11-11 of Figure 1;

Figure 3 is a vertical sectional view taken substantially on line III-III of Figure 2;

Figure 4 is a verticalsectional view taken substantially on line IV-IV of Figure 3,;

Figure 5 is a vertical sectional view taken substantially on line VV of Figure 4;

Figure 6 is an end elevational view of the in tegral supportingassembly for the brake operating mechanism; v

Figure 7 is a top plan view of the supporting assembly; and

Figure 3 is a side elevational view of the supporting assembly taken substantially on, line VIII-VIII of Figure 6.

The drawings show a hoist which in the -pres. ent instance is embodied in well drillin draw- Works. The hoist comprises a fixed foundation in, a hoist reel l2. and in this instance a sand reel 13. The hoist reel has a brake drum [4 and a similar brake drum at the opposite end, and brake bands l5 and [5a which surround said drums; Rollers l5, Ito and IT, a spring IB'and a set screw it position brake band It in relation to drum M in theusual way, and similar elements,

2 not shown, position brake band l5;a. The sand reel has a brake drum 2t and a similar drum on the opposite end and brake bands 2i and 2 la In accordance with the present invention, the brake operating mechanism comprises an integral supporting assembly which includes a base plate 22, a bearing 23, a first pair of spaced pivot ears 2%, a second pair of spaced pivot ears'fila, a bearing 25 fixed to one of the cars 2 a-bearing 25a fixed to one of ears 24a and an equalizer bracket 26 (Figures 6, 7 and 8). Saidassembly preferably is of welded construction. The-bearings, ears and equalizermounting are positioned accurately and, since the assembly is integral, the parts never can become misaligned. A plurality of bolts 27 removahly attach said supporting assembly to foundation lil (Figures 2 and 3).

Bearings 23, 25' and 2511 are axially aligned androtatably mount a brake lever shaft 28, which is the only shaft needed in this mechanism. The pivot ears which do not carry bearings are apertured for passage of said shaft. The shaft car'- ries a brake operating lever 23;. Which'islieyed thereto to turn the shaft. The base platefias sembly can include the usual quadrant 3t}; and the brake operatin lever can be equipped with the usual friction grip SI for locking the mechanism. Crank arms 32 and 32a are fixed to shaft 28 and. extend upwardly and rearwardly' (Figure 5). Ears 24 and 24m carry pivot pins 35 and 3311, respectively, which preferably are fixed to these cars. .Brake band [5,.pivot pin 33 and crank arm 32 are in alignment and likewisebrake' band 150,, pivot pin 33a and crank arm 32a. Pivot pin ,33 carries a lever 3 and pivot pint3a carries'fia similar lever which. extend downwardly and forwardl y; A link 35 connects the extremities of crank arm 32'and lever 34 and a similar link connects the extremities of crank arm 32a and the other lever. The live ends of the brake bands are pivotally connected to these same levers between the pivot pins and the links, as indicated at 36.,

An equalizer 37 is pivoted to equalizer bracket 26 on a pivot pin 38 (Figure 2). Links 39 and 39a connect the dead ends of the brake bands and the ends of said equalizer, which thus anchors these dead ends. The equalizer bracket can have sockets! and too which receive springs 4| and ilo for cushioning the equalizer, and' to retain'the equalizer in a central position when brake is1re leased to assure equal release action on both bands.

A sand reel brake lever 42 conveniently can be mounted to turn concentrically with shaft 28 .on a bearing sleeve 43 which extends inwardly from bearing 23 (Figures 4 and '7). A linkage 44 connects this brake lever with the sand reel brake band (Figure 1). This arrangement enables an operator to control both brakes from a single station.

In operation, rotation of shaft 28 and operating lever 29 clockwise, as viewed in Figures 1 and 3, applies the brake and rotation counter-clockwise releases the brake. Within the operating limits, clockwise rotation constantly shortens the lever arm between crank arm 32 and link 35, constantly lengthens the lever arm between said link and lever 34, and constantly shortens the lever arm between said lever and the live end of brake band [5. The relation of the lever arms on the opposite side for applying brake band [a is the same. Therefore, the farther the brake operating lever moves clockwise, the greater the mechanical advantage of the force which is applied to the brake bands. The operating mechanism of the present invention furnishes this movement with only a single shaft and only one crank arm, link and lever for each brake band.

The brake operating mechanism can be removed as a unit from the hoist. It is necessary only to disconnect the live end of brake band I5 from lever 34 at 36, similarly disconnect the live end of brake band [5a from its lever, disconnect either equalizer 31 from its bracket 26 or disconnect the links between the dead ends of the bands and the equalizer, and to remove bolts 27. The unitary construction of the brake operating mechanism thus simplifies dismantling and reassembling the hoist and the integral construction of the supporting assembly always assures that the parts are aligned properly.

From the foregoing description, it is seen that the brake operating mechanism of the present invention accomplishes a compound leverage with fewer parts than usual, facilitates assembling or dismantling the hoist, and always assure that the'parts are aligned properly.

While I have shown and described only a single embodiment of the invention, it is apparent thatmodifications may arise. Therefore, I do not wishto be limited to the disclosure set forth but only by the scope of the appended claims.

I claim:

1. In a hoist having a fixed foundation, a hoist reel rotatably supported on said foundation, a pair of brake drums, one of which is at each end of said reel, and a pair of brake bands, one of which surrounds each of said drums, a brake operating mechanism comprising a base plate removably attached tosaid foundation, pivot ears and axially aligned bearings integral with said base plate, a brake lever shaft rotatably mounted in said bearings, an operating lever fixed to said shaft, a pair of upwardly and rearwardly extending crank arms fixed to said shaft, a pair of pivot pins carried by said pivot ears, the brake band, pivot pin and crank arm of each pair being in alignment, a pair of downwardly and forwardly extending levers, one of which is carried for pivotal movement byeach of said pivot pins, links connecting the extremities of said crank arms and of said last named levers, the live ends of said brake bands being connected to said last named levers between said pivot pins and said links, and equalizer means anchoring the dead ends of said brake bands, said operating mechanism being removable as a unit from the hoist.

2. In a hoist having a fixed foundation, a hoist reel rotatably supported on said foundation, a pair of brake drums, one of which is at each end of said reel, and a pair of brake bands, one of which surrounds each of said drums, a brake operating mechanism comprising a base plate removably attached to said foundation, pivot ears, axially aligned bearings and an equalizer bracket integral with said base plate, a brake lever shaft rotatably mounted in said bearings, an operating lever fixed to said shaft, a pair of crank arms fixed to said shaft, a pair of pivot pins carried by said pivot ears, the brake band, pivot pin and crank arm of each pair being in alignment, levers carried for pivotal movement by said pivot pins, links connecting the extremities of said crank arms and of said last named levers, the live ends of said brake bands being connected to said last named levers between said pivot pins and said links, an equalizer carried by said equalizer bracket, and means connecting the dead ends of said brake bands and said equalizer.

3. In a hoist having a fixed foundation, 2. hoist reel rotatably supported on said foundation, a pair of brake drums, one of which is at each end of said reel, and a pair of brake bands, one of which surrounds each of said drums, a brake operating mechaniism comprising a base plate removably attached to said foundation, pivot ears, axially aligned bearings and an equalizer bracket integral with said base plate, a brake lever shaft rotatably mounted in said bearings, an operating lever fixed to said shaft, a pair of upwardly and rearwardly extending crank arms fixed to said shaft, 9, pair of pivot pins carried by said pivot ears, the brake band, pivot pin and crank arm of each pair being in alignment, a pair of downwardly and forwardly extending levers, one of which is carried for pivotal movement by each of said pivot pins, links connecting the extremities of said crank arms and of said last named levers, the live ends of the brake bands being connected to said last named levers between said pivot pins and said links, an equalizer carried by said equalizer bracket, and means connecting the dead ends of said brake bands and said equalizer, said brake operating mechanism being removable as a unit from the hoist.

4. A unitary operating mechanism for hoist drum brakes comprising a base plate adapted to be attached to a hoist foundation, pivot ears and axially aligned bearings integral with said base plate, a brake lever shaft rotatably mounted in said bearings, an operating lever fixed to said shaft, a pair of upwardly and rearwardly extending crank arms fixed to said shaft, a pair of pivot pins carried by said pivot ears, a pair of downwardly and forwardly extending levers, one of which is carried for pivotal movement by each of said pivot pins, links connecting the extremities of said crank arms and of said last named levers, means on said last named levers between said pivot pins and said links for connecting the live ends of a pair of brake bands, and means for anchoring the dead ends of the bands.

5. A unitary operating mechanism for hoist drum brakes comprising a base plate adapted to be attached to a hoist foundation, pivot ears, axially aligned bearings, and an equalizer bracket integral with said base plate, a brake lever shaft rotatably mounted in said bearings, an operating lever fixed to said shaft, a pair of upwardly and rearwardly extending crank arms fixed to said shaft, a pair of pivot pins carried by said pivot ears, a pair of downwardly and forwardly extending levers, one of which is carried for pivotal movement by each of said pivot pins, links connesting the extremities of said crank arm and of said last named levers, means on said last named levers between said pivot pins and said links for connecting the live ends of a pair of brake bands, and an equalizer carried by said equalizer bracket adapted to anchor the dead ends of the brake bands.

6. An integral supporting assembly for hoist reel brake operating mechanisms comprising a base plate, two pairs of spaced pivot ears upstanding from said base plate, a bearing upstanding from said base plate, a bearing carried by one pivot ear of each pair, the other pivot ears being apertured, said bearings and the apertures being axially aligned, and an equalizer bracket upstanding from said base plate.

CHARLES J. KEIM.

REFERENCES CITED The following references are of record in the file oi. this patent:

UNITED STATES PATENTS 10 Number Name Date 1,788,141 Attridge Jan. 6, 1931 1,956,432 Young Apr. 24, 1934 2,116,013 Carbon et a1 May 3, 1938 2,151,893 Brauer Mar. 28, 1939 

